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Some refuse to take part and some lie. As a pollster, you can try to model to take into account people who don't want to take part, but you can't do anything with systematic / non-random lying.
This twitter thread explains it well:
https://x.com/philippilk/status/1853365463629131940?t=Fko3d-hp8sJ4HodbXTfWBw&s=19
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I'm not on X and won't click on it due to its fuckwit owner.
But what I don't understand is why they would lie at all? What's the point? It's not like polls aren't anonymous. No 0ne is going to find out. Why would you bother lying? Admittedly, I don't understand why anyone would vote for Trump, but seriously, what's to be gained from lying to a pollster?
I'm not sure I get what you mean. Do shy Trump voters take part in the polls and say they'll vote for Harris when actually they're going to vote Trump? If so, how many of them do we think there are? More than there are, say for example, women? Enough to totally skew the polls, which is why pollsters are correcting for it?